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Non-Newtonian migration of a deformable drop in shearing flows

Citation

Chan, Paul Chun-Ho (1980) Non-Newtonian migration of a deformable drop in shearing flows. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-12122006-093505

Abstract

The lateral migration of a deformable drop suspended in a unidirectional shearing flow of a slightly non-Newtonian fluid has been considered both theoretically and experimentally. Analytical expressions for the migration velocity due to the separate effects of drop deformation and fluid viscoelasticity were obtained for a two-dimensional flow, and then extended to the case of a general quadratic flow. The direction and magnitude of the migration velocity was calculated for the particular cases of Poiseuille flow in a tube and linear shear flow, and compared with experimental data.

The Couette flow problem was studied experimentally. The size of the inner rotor of the Couette device was varied systematically to assess the role of velocity profile curvature on drop migration. Both deformation and non-Newtonian effects were considered. In all cases, the agreement between experimental results and theoretical predictions was very good. Significant observations that were not reported in previous studies include the migration of a deformable Newtonian drop to an equilibrium position between the centerline and the inner rotor, and the close competition between normal stress and shape deformation contributions for the case of a Newtonian drop in a non-Newtonian fluid.

Item Type:Thesis (Dissertation (Ph.D.))
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemical Engineering
Thesis Availability:Restricted to Caltech community only
Research Advisor(s):
  • Leal, L. Gary
Thesis Committee:
  • Unknown, Unknown
Defense Date:24 October 1979
Record Number:CaltechETD:etd-12122006-093505
Persistent URL:http://resolver.caltech.edu/CaltechETD:etd-12122006-093505
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4967
Collection:CaltechTHESIS
Deposited By: Imported from ETD-db
Deposited On:05 Jan 2007
Last Modified:26 Dec 2012 03:13

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